The next is a list of fine Grays, represented by Figs. 31, 32, 49, 67, 68, 77, 90, 96, 108, 113, 117, and 121. Figs. 31 and 32 are red-grays; Fig. 49 is a yellow-gray; Figs. 67 and 68 are blue-grays; Fig. 77 is an orange-gray; Fig. 90 is a green-gray; Fig. 96 is a purple-gray; Fig. 108 is a blue-gray; Fig. 113 is a purplish gray made of rose lake and gray; Fig. 117 is a greenish gray made of lemon yellow and gray. Fig. 121 is a soft gray made of vermilion and gray. Without some of these grays it would be simply impossible to obtain the most pleasing and artistic results in color printing. These colors not only serve to bring out and strengthen the positive colors used in combination with them, but also to neutralize the bad influence of some colors upon others. Colored grays are generally most effective in ornamental printing when used as backgrounds for panels, bands, etc.
Blue-black is represented by Figs. 24, 69, 70, 109, no, and 132. The best of these are Figs. 109 and 110, which are made of deep blue (Fig. 7) and black (Fig. 12).
Photo-black is shown by Figs. 33, 114, 122, 127, and 131. These colors all lean a little to either red, yellow, or purple.
Green-black is represented by Figs. 50, 91, 118, 128, and 129.
Fig. 79 is a good sepia-black. Figs. 97 and 130 are violet-blacks. Figs. 16 and 116 are maroons, the latter being the best of the two. Fig. 44 is citron. Figs. 26, 34, and 115 are photo-browns; the latter is shown in Fig. 343, Plate 60. Fig. 123 is sepia-brown. Figs. 87 and 119 are sage-greens. Figs. 17 and 18 are maroon-reds.
Plate 17.—This plate shows eight half-tone colors produced by two-color mixtures of the colors on Plate 1, with white. The white ink used in this work, with only one exception, is an opaque ink known as zinc white. The only case in which it was not used is the specimen of map work shown on Plate 90; the three tints used in this specimen were made by mixing the colors with magnesia, and were printed over the black. Magnesia makes a transparent tint, which for purposes of this kind is most useful.
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